• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 #ifndef _ASM_X86_XEN_INTERFACE_64_H
2 #define _ASM_X86_XEN_INTERFACE_64_H
3 
4 /*
5  * 64-bit segment selectors
6  * These flat segments are in the Xen-private section of every GDT. Since these
7  * are also present in the initial GDT, many OSes will be able to avoid
8  * installing their own GDT.
9  */
10 
11 #define FLAT_RING3_CS32 0xe023  /* GDT index 260 */
12 #define FLAT_RING3_CS64 0xe033  /* GDT index 261 */
13 #define FLAT_RING3_DS32 0xe02b  /* GDT index 262 */
14 #define FLAT_RING3_DS64 0x0000  /* NULL selector */
15 #define FLAT_RING3_SS32 0xe02b  /* GDT index 262 */
16 #define FLAT_RING3_SS64 0xe02b  /* GDT index 262 */
17 
18 #define FLAT_KERNEL_DS64 FLAT_RING3_DS64
19 #define FLAT_KERNEL_DS32 FLAT_RING3_DS32
20 #define FLAT_KERNEL_DS   FLAT_KERNEL_DS64
21 #define FLAT_KERNEL_CS64 FLAT_RING3_CS64
22 #define FLAT_KERNEL_CS32 FLAT_RING3_CS32
23 #define FLAT_KERNEL_CS   FLAT_KERNEL_CS64
24 #define FLAT_KERNEL_SS64 FLAT_RING3_SS64
25 #define FLAT_KERNEL_SS32 FLAT_RING3_SS32
26 #define FLAT_KERNEL_SS   FLAT_KERNEL_SS64
27 
28 #define FLAT_USER_DS64 FLAT_RING3_DS64
29 #define FLAT_USER_DS32 FLAT_RING3_DS32
30 #define FLAT_USER_DS   FLAT_USER_DS64
31 #define FLAT_USER_CS64 FLAT_RING3_CS64
32 #define FLAT_USER_CS32 FLAT_RING3_CS32
33 #define FLAT_USER_CS   FLAT_USER_CS64
34 #define FLAT_USER_SS64 FLAT_RING3_SS64
35 #define FLAT_USER_SS32 FLAT_RING3_SS32
36 #define FLAT_USER_SS   FLAT_USER_SS64
37 
38 #define __HYPERVISOR_VIRT_START 0xFFFF800000000000
39 #define __HYPERVISOR_VIRT_END   0xFFFF880000000000
40 #define __MACH2PHYS_VIRT_START  0xFFFF800000000000
41 #define __MACH2PHYS_VIRT_END    0xFFFF804000000000
42 
43 #ifndef HYPERVISOR_VIRT_START
44 #define HYPERVISOR_VIRT_START mk_unsigned_long(__HYPERVISOR_VIRT_START)
45 #define HYPERVISOR_VIRT_END   mk_unsigned_long(__HYPERVISOR_VIRT_END)
46 #endif
47 
48 #define MACH2PHYS_VIRT_START  mk_unsigned_long(__MACH2PHYS_VIRT_START)
49 #define MACH2PHYS_VIRT_END    mk_unsigned_long(__MACH2PHYS_VIRT_END)
50 #define MACH2PHYS_NR_ENTRIES  ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>3)
51 #ifndef machine_to_phys_mapping
52 #define machine_to_phys_mapping ((unsigned long *)HYPERVISOR_VIRT_START)
53 #endif
54 
55 /*
56  * int HYPERVISOR_set_segment_base(unsigned int which, unsigned long base)
57  *  @which == SEGBASE_*  ;  @base == 64-bit base address
58  * Returns 0 on success.
59  */
60 #define SEGBASE_FS          0
61 #define SEGBASE_GS_USER     1
62 #define SEGBASE_GS_KERNEL   2
63 #define SEGBASE_GS_USER_SEL 3 /* Set user %gs specified in base[15:0] */
64 
65 /*
66  * int HYPERVISOR_iret(void)
67  * All arguments are on the kernel stack, in the following format.
68  * Never returns if successful. Current kernel context is lost.
69  * The saved CS is mapped as follows:
70  *   RING0 -> RING3 kernel mode.
71  *   RING1 -> RING3 kernel mode.
72  *   RING2 -> RING3 kernel mode.
73  *   RING3 -> RING3 user mode.
74  * However RING0 indicates that the guest kernel should return to iteself
75  * directly with
76  *      orb   $3,1*8(%rsp)
77  *      iretq
78  * If flags contains VGCF_in_syscall:
79  *   Restore RAX, RIP, RFLAGS, RSP.
80  *   Discard R11, RCX, CS, SS.
81  * Otherwise:
82  *   Restore RAX, R11, RCX, CS:RIP, RFLAGS, SS:RSP.
83  * All other registers are saved on hypercall entry and restored to user.
84  */
85 /* Guest exited in SYSCALL context? Return to guest with SYSRET? */
86 #define _VGCF_in_syscall 8
87 #define VGCF_in_syscall  (1<<_VGCF_in_syscall)
88 #define VGCF_IN_SYSCALL  VGCF_in_syscall
89 
90 #ifndef __ASSEMBLY__
91 
92 struct iret_context {
93     /* Top of stack (%rsp at point of hypercall). */
94     uint64_t rax, r11, rcx, flags, rip, cs, rflags, rsp, ss;
95     /* Bottom of iret stack frame. */
96 };
97 
98 #if defined(__GNUC__) && !defined(__STRICT_ANSI__)
99 /* Anonymous union includes both 32- and 64-bit names (e.g., eax/rax). */
100 #define __DECL_REG(name) union { \
101     uint64_t r ## name, e ## name; \
102     uint32_t _e ## name; \
103 }
104 #else
105 /* Non-gcc sources must always use the proper 64-bit name (e.g., rax). */
106 #define __DECL_REG(name) uint64_t r ## name
107 #endif
108 
109 struct cpu_user_regs {
110     uint64_t r15;
111     uint64_t r14;
112     uint64_t r13;
113     uint64_t r12;
114     __DECL_REG(bp);
115     __DECL_REG(bx);
116     uint64_t r11;
117     uint64_t r10;
118     uint64_t r9;
119     uint64_t r8;
120     __DECL_REG(ax);
121     __DECL_REG(cx);
122     __DECL_REG(dx);
123     __DECL_REG(si);
124     __DECL_REG(di);
125     uint32_t error_code;    /* private */
126     uint32_t entry_vector;  /* private */
127     __DECL_REG(ip);
128     uint16_t cs, _pad0[1];
129     uint8_t  saved_upcall_mask;
130     uint8_t  _pad1[3];
131     __DECL_REG(flags);      /* rflags.IF == !saved_upcall_mask */
132     __DECL_REG(sp);
133     uint16_t ss, _pad2[3];
134     uint16_t es, _pad3[3];
135     uint16_t ds, _pad4[3];
136     uint16_t fs, _pad5[3]; /* Non-zero => takes precedence over fs_base.     */
137     uint16_t gs, _pad6[3]; /* Non-zero => takes precedence over gs_base_usr. */
138 };
139 DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
140 
141 #undef __DECL_REG
142 
143 #define xen_pfn_to_cr3(pfn) ((unsigned long)(pfn) << 12)
144 #define xen_cr3_to_pfn(cr3) ((unsigned long)(cr3) >> 12)
145 
146 struct arch_vcpu_info {
147     unsigned long cr2;
148     unsigned long pad; /* sizeof(vcpu_info_t) == 64 */
149 };
150 
151 typedef unsigned long xen_callback_t;
152 
153 #define XEN_CALLBACK(__cs, __rip)				\
154 	((unsigned long)(__rip))
155 
156 #endif /* !__ASSEMBLY__ */
157 
158 
159 #endif /* _ASM_X86_XEN_INTERFACE_64_H */
160